Composite metal ingot.



shall' be firmly -interlocked Lowest. l

- To all whom it may concern I il' `Tgpg rana meni..

FERDINAND E. cAivDA, on NEW Yoan, N. Y.

b Specification of Letters Patent.

` COMPOSITE METAL INGOT..

' ratemeanpe. aga, rais.,

Original aplllication flled September 6, 1911, Serial No. 647,958. Divfi'ded and this application filed November 6, 1911.

Serial Nol: 658,889.

Be it known that I, FnnbINAND E. GANDA, a Icitizen of theI .United States of America, and a resident .ofvNeW York in the county of New -York and State 4of ments in Composite' Metal Ingots, of-Which the followingis a specification.

ingots such as maybe used for forming vault plates, safe plates, jail bars, etc.,'and comprises an ingot compo'sd of outer layers and an intermediate layer, the intermediate layer preferably of a different Agrade of .metal than the. outer layers, said intermediate layer interlocked with the. outer layers as hereinafter described.

--The object of my inventionv is to providel an im roved composite ingot of the class describe wherein -the several vlayers 'of metal I willnow roceed to describe my invention' with re erence 'to the accompanying dr'awing 'showing a transverse horizontal section of the ingot. 4

In. said drawing, 1 designates the intermediate layer and' 2", 2 designate theouter layers. Said Outer layers are' provided in their ends grooves ornrecesses 3 of dovetail contour,

-y and intermediate layer 1 is provided with corresponding-projecting portions 4' extend- Iing into 'said' dovetail grooves 3, and so firmly looking the several 'layers of metal together. f

In pract1ce the ingot is formed by placing the outer layers 2 within a mold and pouring molten metal to form the intermediate layer 1 into the mold, the molten metal so poured filling-the dovetail grooves 3. The process of so forming the ingot, and

the mold used for forming such ingot, areb illustrated described and claimed in my application r. No. 647 ,958, filed September 6,

1911, '(Patent No. 1,013,860, dated January' 9, 1912) of which application the present case is a division. g

NJew York, have.

with .transversely under-cut.

of a relatively high carbon steel, as .-.com-. pared with the intermediate layer 1, the

In practice theouter`layers'42are usually metal'cast Vto form layer 1 having,therefore,

a higher melting temperature 'than does the metal of the outer .layers 2. Thisg'reatly facilitates'the formation of at least'a partial weld between layer-1 and layers 2; and. Myinvention relates to composite metalin practice such a'weldli's realized. Theinter-looking of the layers 1.'and 2 causes the outer layers 2? to follow the layer-'1 Aduring the contractio'n 'of the metal- 'of such-'layer 1, during solidlfication and-cooling.

versely under-cut recesses of dovetail'contour, said'l intermediate. layer' 4extending partly but not completely around, the ends' of said outer layers', and 'extending into said 'undercut dovetail recesses andsubstantially filling thesame, whereby the several layers are effectively interlocked. k I

2. A composite metal 1- ingot 'comprising Outer layers and an intermediate layer,'said outer layers having in their ends recesses extending from the said ends of said layers inward and Which, as viewed'fromthe ends of said layers, are of transversely undercut configuration, said intermediate layerl eX- tending partly but not completely around the ends of said outer layers, and 'having portions extending into said undercut recesses and substantially filling the "same, whereby the several layers-are effectively interlocked.

A composite metal ingot comprising two layers, one of said layers having in its .ends transversely undercut recesses extend- .il'lgot composed of The several layers of metal of which the .ingot is 'compos'ed being firmly united to each other,- as above described, the-ingot.

ving from thesaid endsiof said lsyer inward, sfJecification in the presence of two subthe other 1ayerdhanging; projctions exend-A scribing witnesses. ing over t e en s o said `en -recessed ayer' V iI-lto said undercut recesses, and substan-v FERDINAND E' GANDA' "5 tlally filling the same,-whereby the two lay- Witnesses: I ers are effectively i'nterlocked.v H. M. MARBLE, y In testimony whereof I have. signed this I D. A. DAvms. 

